Improvement in sewing-machines



ALBERT KOMP, 0F new vom, n. Y.

.IMPROVENI ENT IN SEWING-MACHINES.

Specication forming part of Letters Patent lo. 108,033, dated October 4,1870.

To all whom it may concern:

Be it known that I, ALBERT KOM-P, of the city, county, and State of NewYork, have in,-

i vented a new and useful Improvement in Sew` ing-Machinesgand I dohereby declare the following to `be a full, clear, and exact descriptionthereof, which will enable those skilledin the art to make and use thesame, referencebein g had tothe accompanying draw-- ings, forming partof this specification, in which drawings- Figure l represents a frontview of this iuvention, partly insecticn'. Fig. 2 is a sectional View ofthe feedmechanism. Fig'. 3 is a side View ofthe machine. Fig. 4 isahorizontal section of the saine.

Similar letters indicate corresponding parts.

This inventionrelates partly to the feed mechanism of a sewing-machine,which is eI- fected by the action ofthe presser-foot to which therequisite motion is imparted by the combined action of a-cam on themain. shaft and of another cam on the needle-slide. The invention alsorelates to a braid-guidewhich is securedto a lever hinged, ashereinafter described, to the cloth-plate of the sewingfrnachine, andwhich is held down upon the throatplate of the sewing-machine by theyielding pressure of the presser-foot, so that it can be readily raisedfor the introduction ot the braid, and that the same, while thevoperation i of sewing progresses, is free to accommodate itself to anyinequality in the thickness of the v braid. Y

In the drawings,the letter A designates the cloth-plate of asewing-machine, from the back part of which rises the arm B, (see Fig.3,) which forms the bearings for the main shaft C, and to the front endof which are attached theneedle-slide D and the.presser-foot F. Thispresser-foot is subjected to the action cfa spring, E, and it is fittedin its guides so that it canreadily rise and fall, and also swing in thedirection in which the feed is to take place.`

From the shank of the presser-foot extends an arm, a, over a-cam, b,mounted on the main shaft, and as this cam revolves the presserfoot isalternately lifted up against the action of its spring, and then allowedto sink down,

. pressure,

so as to clamp the material to be sewed down upon the cloth-plate.

From the edge of the presser-foot bar projectsa nose, c, against which`acts a cam, d,`

attached to the edge of the needle-slide, (see Fig. 2,) and the spring-E is so adjusted that it has a tendency to hold the presser-foot downThe reciproand in toward the needle-slide. eating motion of theneedle-slide and the rising and falling motion of the presser-foot areso timed in relation to each other that the presser-foot `is down whenthe needle enters, and when the needle has been withdrawnfrom the cloththe cam d of the needle-slide acts on the nose c, and the feed-motiontakes place. Then the presser-foot rises, together with theneedle-slide, and remains stationary for a short time, until theneedle-slide has descended fanA enoughv to carrythe arm d clear ofthenose c, when the presser-foot falls in toward the needle-slide and isimmediately depressed, so

as to retain the cloth in position while the needle penetrates throughthe same. A setscrew, e, serves to regulate the length of the stitch.

To the side ofthe cloth-plate is pivoted a lever, Gr, which carries thebraid-guide f.' This braid-guide consists of an angular piece of `sheetmetal, as shown in the drawings, and it is secured to the lever G byset-screws, so that it can be readily taken off and changed for another.The working part of the braid-guide lies dat upon the throat-plate g,which is provided with an offset equal in depth to the thickness of thebraid-guide, so that when said braid-guide is down its upper surface is"level with the highest portion of the throatplate. In the under surfaceof the braid `guide is a groove, t', to receive the braid, and byraisingthe braid-guide up the braid can be readily introduced under it. Afterthe braid has' been adjusted under the braid-guide the latter isdepressed, and it is held down during the action of the needle by theend of the presser foot, which extends somewhat be- Tond.its edge, as.shown in Figfl, and the braid-guide is thusr held down by a yielding sothat it can readily adjust itself to any inequalityexistingin thethickness of the braid. v

What I claim as new, and desire to secure by Letters Patent, is-

- presser-foot F, all constructed and arranged 1. The arrangement of thecam b on the substantially as set forth.

shaft; C, arm a, presser-foot F, nose c, cam d A. KOMP. on theneedle-slide, and spring E, all as shown Witnesses: and described. W.HAUFF,

2. The braid-guide f and the hinged lever G. WAHLERS.,

G, in combination with the throabplate g and

